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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a70456f8e525e1487a6f1774dc4672b390e19150248e1eccb0be98398387afc' 
  AND token = 'bCCKLgMqsVEaQQCkNJdSPM4+HI9p3oeRxk6/020zLQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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