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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cacebca315ea49e2bbdf6ba96c237f518aa27fac9345beee59adeefac47b795' 
  AND token = '0BrctV7U3M0Ziq85eHMGRddqwSnlZir4zcTM0q7wIzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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