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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dddc9f24f156645a2f3555524167b0fea736dd2788ad293dc7daf7b8337efdc9' 
  AND token = 'OpN3++5KX2AAk2VTS7kwo1YFMfVB5rHHuWqUi75PvWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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