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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c1a6e66220c36c3066774332637f9702976b60202d350dc377c5a4cccc6227' 
  AND token = 'qR9R2t15jk46qUJAu2BDl53hzP3uW3AgZjA072LYwU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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