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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f7ae36f413c70187e8e187144f028a512d10a88c917ae62d5cbb72361b8dd0' 
  AND token = '8V+HF8xrmjevd2gmUn1YiTUyytpexbeO4ysyDSfj3ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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