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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de35e2977066b83f3ec5bc1c8cd52b2bd17bc0128d336f6c2063e0144e926bbb' 
  AND token = 'wxxa6/LRNVTnYQY28D9u6FqZdZ+tkpNpwFdrU10QXYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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