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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3c4f214db8dca91884505c6f09c985a2e5ee58bc13c8fe757482743387b8bae' 
  AND token = '+FXTRJI6rwl+zO+mpuN2yBOGRk06iytYlL5p7ayN5yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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