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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2759d9c6062b9c54e9e655dabb23a04e0215a334c3d26299232b2d2a0aa384ee' 
  AND token = '6sSJnkqLx8mRvdNquJH+Ao7cn2E8WyvmsxUaTtPZQI4=' 
  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"
    }
  }
}