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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9aa46f28c6c6fa89e5a4b6d16dc48ddecc3cebcc205eebc56b1fc77ac1c8abc' 
  AND token = 'lEs06a7L4xpheXRrnIgw9AXhSP1IG60v+iydp6ZNOZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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