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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5171a9dd7f0983b0e7d04e5b5d19f1fa936884d96ae9c5e3b7334759fadb44bc' 
  AND token = 'K9S+9j9QQLCqY3MkJfrQ+cxyKijd2xBT7tx1aHb2mEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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