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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5234328449dc2ae055e63ac196030e51e4245aa255a7dd9222079d4e80fc5619' 
  AND token = 'UpqI/L815kcrhfNk0hlWIwp58arEdNtBeA/jEAb+maM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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