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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a24fbd10bbe0e1b2f71858a16e073a810cbad49dcddd4375f96c8e664c1ba26a' 
  AND token = 'tZODE6hYbSJin66JIXYOnbyr2YnyyRQEBRsEMCGYDAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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