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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78117a61d18f4fcfc1066d7ef387ec458f78a4417a0f18e9f06782be1c08d614' 
  AND token = '6srePmFyLu10gt5TPH6/ZBsYxUJ4qKcgLiMAjV++wAM=' 
  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"
    }
  }
}