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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf9e8864d32e8c057431371e92658e6c7457ca1472d1e9fa79c144ad7ebfa58' 
  AND token = '2qrI2iyM8cIXKxrKzk53ogAZryWrIBXFlzqW+ZuLaMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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