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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5de8e1d03bbcc48784e49b29d79c7cb6be5e85fd10e7debd0729282aa7485e9a' 
  AND token = 'NEWYADSiG5xGZeIZoJIohy3mVyYKPVfBQZr4RQ2xDlg=' 
  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"
    }
  }
}