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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf52ba1c44ed0482821e97eaf4dce10d2fc26dc1642501e5cbf3e1ab7d9d479' 
  AND token = 'Za5XkLaQ5VT3PHe/lVNYxjLxXGCPd/zOr8c0WVgIRBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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