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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '157f2a0a97a194b4ba7d64a267bcdadf071b5e28ff3f315cda20f200894917cf' 
  AND token = 'YbnWAd6/FMIWXK5dh1FmqXH7dl8BNbZQzPZRGMdQ5F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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