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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6dd742ce8cca718def136a747e05d7d90b9a0562904c09313557252aa7b39da' 
  AND token = '2UTpitBShq7jWIeMmg7v6MZKbzVy6Bv0g1Js+vQ7Bu4=' 
  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"
    }
  }
}