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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6b48e2b6edebd31d666f57586d2a4dcd731d0474df4a712da1046f0155daa0' 
  AND token = 'O5RPNMrUBDVdYEEuylUMUaVhLC6nj+POjsPrhVJenfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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