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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31110637d6f3116542f53fccff823a2da87b79f47ea55eca70a11576d09fd931' 
  AND token = 'K5CfrCthY80WBVGWRAjJUc++NErK+VSwrR+ZkH9B6cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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