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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c941a6ca0e201a410bd9bcee9cfda494c7097ef990a5ca7233ff0cee109af3eb' 
  AND token = '97ydpsi7hpFyA9TFjeEnJSf5tV02IWuD12J9yPE3Nlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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