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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '059d56f66cffe5ff1797995722f5e4a033d09b22fc05764f1910783289a45ee5' 
  AND token = 'f+Hum1qCOSIVrurX6OKVbTdcu1vAacmDGzGK2P4IO30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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