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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc8e6533900862f46ea6fb838e074c62212b12801d607a47a989cfe1ebf67a1' 
  AND token = '4lSSO+33FuKfXSQ68yqjPIUIJKP6EwjiAmX4fWgiYzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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