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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68cbc287937944f4bc03e0cfb5c17367c39ce0ca8ebe1402a975ec14cc42e865' 
  AND token = 'drpLc2G1Ozof3I6sLYVY6yFNFbbuXWqyLTfo0wiHtVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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