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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08983d90430686416a13a36b7e8b87951ac23b59b5b0338399a8b00849a53f8b' 
  AND token = '2DPYuaVheYxqyJ6NjArR7vrLRdUqiMXM1UJNI8a4RHA=' 
  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"
    }
  }
}