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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '282203826a3420a4851c8eb8c1702389047025e46ae705045b36b784cddf0500' 
  AND token = 'dza3R5JpdQ4vQW7dAS/c39LwFo6StNBQWzg7AHOhBBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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