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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15e97307426e46933c4e202fe770a1b519cf71f0097e273b0c5a1790f9223a04' 
  AND token = 'BYz+2KfaGveXmv9tQ0vn9o6Ix15u2khMatnF5oYUR8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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