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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a09a679d8ae00b7f395748eced075ff64e855d6286ee7a4767c8e92edc6c339' 
  AND token = '/NUVSIkiBqEcEMp4DWvhyX4myBBCdKyd8kzYVaF5EPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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