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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77cde9eb856b22e9c3af893c25e62dfaa69330329370a29454be062edab7fe93' 
  AND token = 'UWUIKAsjmO2VuLhq+lMyi9be3azfYN5VnECmm3YEg4Y=' 
  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"
    }
  }
}