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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b834dc2d966eb5d751f3fa43a4807f362efb44f40a8beb484177f3ca25040e' 
  AND token = 'rq8Up9x9kqYnsAxJRK26pRANztQAUyuNmTv4EAON5nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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