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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '141776b045aa426abef3e6113ac070287114837f6ac2f2e05f5742b88faef0dd' 
  AND token = 'BX0MfJV8+3rz9MDmEVZOwrDaRSKVCVkYE3VDvD34A2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}