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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '529cc0ee84125c74eb1c8b30bc63d5d7607ac679d3feeb5fd5ea28ef6b9b650f' 
  AND token = 'm+mM29sxtFW3HdDOSiOtgajMr7ZxdT02+Bqppz6/FS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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