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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f190b68fc1fa4d8c7aba86ea4877df6263b1b3517d3bea75a0ac33fac3a49c7' 
  AND token = 'URQfgK2eHLBLD1HIFGvux0DKPZRf35ZdulC6k3TiUqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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