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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '536daa7ef8e70ac0b60098190d11506fa17d004bdbe3d9e12ef6ecfa7792e12b' 
  AND token = 'VNhdx/NubM919AbUNE+5El2l7rpiEJbPCO8nzz46Gzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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