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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d82dcbc6516214e84b00ed39501ecf042388013d1d11ffdb7a59b0e5f746d5a' 
  AND token = 'HmkrOCWw+MS10uOycXDqHz3nKKYTxxewirZ5Qyc3uUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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