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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '151ebba1582274c197d5c149ec590a5f01e5808527a64cde9fc1c40633188de9' 
  AND token = 'H6Ywve4rv0MVsB6uy54aLNV/HpsmhMeTL9AgToXaXpU=' 
  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"
    }
  }
}