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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daad71acb71166d4e6d146c6856042e1006a1c1f2fd38575a5f3bd9d6386d725' 
  AND token = 'qBn8zS1w2aIwc5ivZSxTDn8clltQBGMwpwcVrHC1uWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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