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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd33e6a6a13c5d2dc44bcaf1ef8e3e1e02fd677ed58e61f2dfff260b3eb25bdc' 
  AND token = '/sEvg8x3SvQrwd9t7wyVIQRtZmcY7smKxvg2QrOahXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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