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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c07428fa9d4f18188151ac1b21b66971f68fa2fc0386eb02550ebdd725801a9a' 
  AND token = 'u0B6V7XA+gievp5c93npP1KhS6WlRN6sZlFzHSe7ozo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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