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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a73c22720867a9aa6f19ad6a4b3edd5e142359d3472b2391e536f5247a3ca0f0' 
  AND token = '0d4fE7xqaGpPi9cbZkqsN1XjyU62ThPnNXuoIbOILrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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