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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b01650fdb7340b887e877d657c00992204a6a8f72711658b1bac1383b17592d4' 
  AND token = 'V825Nni+m14Z2B58kD4NvXztsU7lzntcFPkpea344cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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