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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a98132ce67d65712d611035ad8b8edb322fc0b87a7564cce2dae4380f9378d' 
  AND token = '1sCXAiXxTvyjQfB0VaHprHLE3Xsn3YjGRRGZ/Dur0V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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