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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c4b26e0f5ba4aa28cd86e60656d096dc88ec7425c17abf58bdd0acdfb3523a9' 
  AND token = '3ook0aXy7FdpmidYFUh4jLghKT1gSQx6b55clMfMPOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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