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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33210e93328d58e449a3e7d42cbeb9b0a3892e2a494b2fe869dcfd39c1e86149' 
  AND token = 'gcCPWD+11SXNRO8hU0O9ieO5kqRj5uMZ9SAwVWqpVzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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