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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd2104dbd0b2ce1cc7a09b95a68620d7311cd00c1b8c3a1d85dd37709dc2ff2' 
  AND token = 'RWM9rs+EGNdM7mHPu/ZZF9QXRCH4iniPqyMaPxoqjZA=' 
  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"
    }
  }
}