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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc04aae18f841b9175269ea18c5403df908acb130bb1722bb3e70b9c38a937e4' 
  AND token = 'C+GIb6PI1ooXUkN/0aEc1cd6JKQ1gtLAtzD9ISiF/j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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