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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd105f42045e8a39830384a894de1a78fc380c0992a2a2c0fa12d9480eb826f23' 
  AND token = '3Trrvf9XQoqlyz91T8K8/Te8gRyZQkFyhlYXCaKIFUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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