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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd40f7f262cd98bf06a6ad9b05b4a3be62aaaf5ea5cb58aeeeb8f237b6fad0e16' 
  AND token = 'L2E95WVkQLYKkQfseSW9Xo/O3ksnelSHWZaZHzoTP/Q=' 
  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"
    }
  }
}