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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6ba245a4477f4c96b419d2ae1e209ea1111ee0c2e3e739cfa858e2df2cc3649' 
  AND token = 'Z6P/RlFF8lEMf20ZPSrQyVu/3ntJby4y9JWq0txEcS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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