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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab4050b7c4395f13a3c745cd71acbd33a5d0e924866b39784d41b7752a1b855c' 
  AND token = 'WAu0od/CB5EckWXHD5yYRXZtjloZfsFM4mS9NV/7bDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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