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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd656958e810e15c8dd1ab7c2b0d5d32f5b9db6aa33762b818b18faa0617dee4e' 
  AND token = 'Q/DbtR0f/QJPRvJy9UeyzN4A40W2NyR9EpZ8ngkd3II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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