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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056c4e559245982c15a337a3861f9e57956c345414e8e4927c8879f1c97c59da' 
  AND token = '78KyfD3VMGvtiVdi/c0fuJqnR5zW6Z8bK6R8Tx7OvNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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