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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94995449a2ea5a6b1da64858e9257e99dc1b4b8c07a1d5894126b01d16d94b6d' 
  AND token = 'kE/GMOVMMyQFEEKQZiOCsA1Hzn9CyINluW7Sn3L/DHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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