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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b42a37cc825b32aa0f68a3da3c7672c2e76c29223ee1ddf4881ee627c846ee93' 
  AND token = 'SLZbJjNC/JewGU5g/pgJd6if3MgZDeY54MLGJplXrcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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