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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bedd708f748e538a90c714c90b761bd667854220de0f9de80afc7232c91bafa' 
  AND token = 'Z40Lz40jdGJ7xIZ+nMTHP5tiZlMuVPxAJJXwwc8lulQ=' 
  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"
    }
  }
}