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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1460a833f7cf5820002e6aff32f773f92c0feb6d239bd17800dc64f508a801b8' 
  AND token = 'gAa/2pZeEetyocPhWpSGhn9H+x+Fe+d9f1xjuvYCdMA=' 
  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"
    }
  }
}